The Best Power Unity UT3k, UT4k, UT5k, and UT8k systems were manufactured until Best was merged with Powerware in 1999. They were offered as a Best Power branded unit and also sold with IBM AS/400 computers. Power Pros still offers expert tech support and battery replacements on this entire product line. If you have any questions or if you don't see your unit listed, please call 1-888-330-2538.
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